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What does CW stand for?

CW stands for Call Waiting

This definition appears very frequently

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Other Resources:
We have 56 other meanings of CW in our Acronym Attic

Samples in periodicals archive:

Caller ID/Call Waiting, which allows the user to see who is calling through on Call Waiting when they are on the phone, is called a Class II feature by telephone service providers, who are rolling out the service in their respective markets.
To keep your connection, you typically have to disable your phone's Call Waiting feature.